Abstract In this study, we investigate numerically the hydro-mechanical behavior of fractured crystalline rock due to one of the five hydraulic stimulations at the Pohang Enhanced Geothermal site in South Korea. We use the commercial code FracMan (Golder Associates) that enables studying hydro-mechanical coupled processes in fractured media in three dimensions combining the finite element method with a discrete fracture network. The software is used to simulate fluid pressure perturbation at fractures during hydraulic stimulation. Our numerical simulation shows that pressure history matching can be obtained by partitioning the treatment into separate phases. This results in adjusted stress-aperture relationships. The evolution of aperture adjustment implies that the stimulation mechanism could be a combination of hydraulic fracturing and shearing. The simulated extent of the 0.01 MPa overpressure contour at the end of the treatment equals to ∼180 m around the injection point.

中文翻译：

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韩国浦项裂缝性地热储层PX-1井二次水力改造流体力学分析

摘要 在这项研究中，我们对韩国浦项增强型地热场地的五种水力刺激之一引起的裂隙结晶岩的水力学行为进行了数值研究。我们使用商业代码 FracMan（Golder Associates），它能够结合有限元方法和离散裂缝网络，在三个维度上研究裂缝介质中的流体力学耦合过程。该软件用于模拟水力增产过程中裂缝处的流体压力扰动。我们的数值模拟表明，压力历史匹配可以通过将处理分成不同的阶段来获得。这导致调整后的应力-孔径关系。孔径调整的演变意味着增产机制可能是水力压裂和剪切的组合。